Meng Yu’er, the successor of the Shun Kingdom, has just come of age. Can you guess what her biggest wish is? It’s getting married smoothly! Because it’s predicted that she’s doomed to live a lonesome life. When she’s forced to face her fate at her fourth fiancé’s funeral, Xi Baichuan comes back in her life. Xi Baichuan is Yu’er’s non-blood uncle as well as mentor throughout her life. He might be a well-respected hero on the battlefield, but in her eyes, he’s just annoying and never takes things seriously. However, in his eyes, she’s the lovely girl he’s been taking care of since day one and his affection for her grows day by day. With a mysterious assassination taking place, the two have chances to work together to solve the case. Yu’er begins to notice that Baichuan becomes less annoying and more attractive. But she warns herself not to cross the boundary—they are uncle and niece after all! Will Yu’er follow her heart? And what would their relationship become in the end?